Yup, agreed.
They need to just go back in time now. Let them come out and exercise, then back to the lockers for the national anthem. Then announce the teams or players back onto the fields. A shame it's come to that though.
Players have already announced thinking of ways to skirt the rule already and get messages across another way. Put the current rule in place - and add an addendum to it that if anyone purposely skirts the written rule as is, that they get fined anyway if they skirt the rules.